A107037 Indices of squarefree Jacobsthal numbers.

1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 19, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 37, 38, 39, 41, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 56, 57, 58, 59, 61, 62, 64, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 82, 83, 85, 86, 87, 88

Offset

1,2

Links

Amiram Eldar, Table of n, a(n) for n = 1..899

Mathematica

Rest[Flatten[Position[CoefficientList[Series[1/(1-x-2x^2), {x, 0, 100}], x], _?SquareFreeQ]]] (* Harvey P. Dale, May 27 2016 *)

Crossrefs

Cf. A001045, A005117, A037918.

Sequence in context: A302569 A235034 A331682 * A031994 A032897 A032856

Adjacent sequences: A107034 A107035 A107036 * A107038 A107039 A107040

Keyword

nonn

Author

Paul Barry, May 09 2005

Extensions

Offset corrected by Amiram Eldar, Feb 25 2024

Status

approved